<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title></title>
  </head>
  <body>
    <!-- 准备好一个容器 -->
    <div id="test"></div>

    <!-- 引入react 核心库 -->
    <script
      type="text/javascript"
      src="../../react-js/react.development.js"
    ></script>
    <!-- 引入react-dom 用于支持react操作dom -->
    <script
      type="text/javascript"
      src="../../react-js/react-dom.development.js"
    ></script>
    <!-- 引入babel 用于jsx转为js -->
    <script type="text/javascript" src="../../react-js/babel.min.js"></script>

    <script type="text/babel">
      class Time extends React.Component {
        state = { time: new Date() };

        componentDidMount() {
          setInterval(() => {
            this.setState({ time: new Date() });
          }, 1000);
        }
        render() {
          return (
            <div>
              <h1>hello</h1>
              <input type='text' />
              <span>现在是:{this.state.time.toTimeString()}</span>
            </div>
          );
        }
      }
      ReactDOM.render(<Time />, document.getElementById('test'));
    </script>
  </body>
</html>
